net/i40e: fix queue region DCB configure

DCB is not necessary to be configured if no user priority of
queue region is requested.

Unexpected configuration of DCB will cause unexpected behavior, like
FDIR does not work on those queues, but could cause more issues.

Fixes: 7cbecc2f7424 ("net/i40e: support queue region set and flush")
Cc: stable@dpdk.org
Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
Tested-by: Yuan Peng <yuan.peng@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>

diff --git a/drivers/net/i40e/rte_pmd_i40e.c b/drivers/net/i40e/rte_pmd_i40e.c
index 7ce5d02..c49c872 100644 (file)
--- a/drivers/net/i40e/rte_pmd_i40e.c
+++ b/drivers/net/i40e/rte_pmd_i40e.c
@@ -2818,13 +2818,23 @@ i40e_queue_region_dcb_configure(struct i40e_hw *hw,
        struct i40e_dcbx_config *old_cfg = &hw->local_dcbx_config;
        int32_t ret = -EINVAL;
        uint16_t i, j, prio_index, region_index;
-       uint8_t tc_map, tc_bw, bw_lf;
+       uint8_t tc_map, tc_bw, bw_lf, dcb_flag = 0;
 
        if (!info->queue_region_number) {
                PMD_DRV_LOG(ERR, "No queue region been set before");
                return ret;
        }
 
+       for (i = 0; i < info->queue_region_number; i++) {
+               if (info->region[i].user_priority_num) {
+                       dcb_flag = 1;
+                       break;
+               }
+       }
+
+       if (dcb_flag == 0)
+               return 0;
+
        dcb_cfg = &dcb_cfg_local;
        memset(dcb_cfg, 0, sizeof(struct i40e_dcbx_config));